Seal



Dc. 22, 1942. w. w. MEYER SEAL Filed July 22, 1940 Patented Dec. 22, 1942 BILL Walter W. Meyer, Arlington Heights, Ill, assignor to Rotary Seal Company, OHM, a cor pcration of Illinois Application July :2, 1m, Serial No. was:

My invention relates in gmeral to shaft seals and has more particular reference to the provision of means for sealing rotating shafts to prevent the escape of fiuids along the shaft past a wall or Journal in which the shaft extends.

Animportant object of the present invention is to provide an improved seal assemblyof simplified construction and unusually efiicient operating characteristics; a further object being to provide an improved seal seat element for application on theshaft in position to co-operate with the end of the wall or hearing through which the shaft extends in order to provide a perfectly finished seal seat without requiring the end of the hearing or wall itself to be finished for the reception of the seal.

Another important object is to provide an improved seal assembly for use as a replacement unit without requiring the reformation of the shaft, wall, or bearing on which the seal is adapted for use.

Another important object is to provide a seal construction for use outwardly of a casing on the end of a shaft projecting therefrom and carrying a driving coupling, the seal utilizing the coupling as a means for retaining the seal in place.

The foregoing and numerous other important objects, advantages and inherent fimctions of the invention will become apparent as the same is more fully understood from the following description, which, taken in connection with the accompanying drawing, discloses a preferred embodiment ofthe invention.

Referring to the drawing:

Figure 1 is a sectional view taken through a shaft fitted with a seal embodying the present invention: and

Figure 2 is a perspective view of the several parts forming the seal shown in Figure 1.

To illustrate the invention, I have shown on the drawings a shaft seal assembly Ii for use on a rotating shaft I t for sealing the same against leakage alongthe shaft through an opening il in a wall through which the shaft extends. In the illustrated embodiment, the opening II is defined by a sleeve bearing i'l carrying the shaft and,in turn. supported as by press-fitting in an opening ll formed inthe wall II of a casin through which the shaft extends. the shaft outwardly of the casing being formed for connection with a coupling member 23 by means of which the'shaft may be constituted asa driving element.

Thesealassembly Ii is adapted foruseasareplacement unit, and consequently I prefer to form 2 Claims. (cuss-1) appliedontheshaftattheendofthebearing n without requiring any reformation of the shaft or bearing. To this end, I provide a seal seat element-2! comprising a disk having a central opening I! of a size to freely receive the projecting endof the shaft adjacent the end of the bear- I ing II. This disk, on one side, is provided with an annular socket II in which'is seated an annular gasket 20, preferably of resilient, rubberlike material such as natural or synthetic rubber. The opposite side of the disk" is provided with an annular embossment 3i surrounding the opening 21, the. surface of this embossment being finished to form a seal seat". An anchor pin it is fastened on the disk 28 in position projecting radially at the peripheral edge thereof, the anchor pin II preferably having an end secured in a socket II formedradially in the disk 2', the opposite end of the pin ll being bent to form an offset latching finger II. The seat element comprising the, disk 2| may be assembled in operating position by passing the same over the outer extremity of the shaft II, the disk I! encircling the shaft with the gasket 2! in facing engagement with the end of the bushing i1 and the latching finger II engaging the wall fl in-a fashion preventing reladrill a suitable socket for the reception of the latchingfinger 30. n a v The seal assembly II also comprises an annular cup-shaped element 43 having annular walls 45 and a bottom 41 formed with an opening .9 adapted to loosely receive theoutwardly extending end of the shaft", said opening 49 being defined'by an embossment ll formed on the bottom of th element Q3. The embossment is finished with asmooth sea] surface adaptedto cosoperate' with .the surface II of the seal seat. whereby to form a running-seal between the seat element 25 and the seal element ll. The element 43 may be assembled on the shaft II after the seat ele ment 2! has been placed, th cupsshaped element 4! being app ied around the shaft with its thepartscomprisingthesealsothattheymaybe and seating at such end of'maxinnun diameter within the cup-shaped element 53 upon the bottom 41 thereof, the opposite end of the spring, which is of smaller diameter, preferably facing the open end of the cup-shaped member, although, of course, the spring may be arranged in inverted position if desired.

Within the cylindrical walls at of the cupshaped member, I arrange a gasket 55 of. resilient, rubber-like material, such as natural or synthetic rubber, said gasket 55 being sized peripherally to tightly fit within the cylindrical walls $5 of the cup-shaped member.

The gasket 55 is formed with a central opening 51 and seats upon an annular shoulder 59 formed in a fitting 61, which is adapted for attachment on the projecting end of the shaft I3.

The projecting end of the shaft i3 is preferably threaded, as at 63, and is preferably tapered, as at 65, inwardly of the threaded portion 63. The fitting 8| comprises a member formed with a socket Bl tapered to fit the tapered portion 65 of the shaft, the bottom of the socket 61 being threaded for attachment on the threaded shaft portion 83 so that the fitting 61, with the gasket 55 applied on the seat 59, may be assembled on the shaft, with the gasket 5.: in position within the cylindrical walls of the cup-shaped member 43, merely by applying the fitting 6| upon the projecting end of the shaft and screwing it thereon until the tapered socket 61 wedgingly receives the tapered shaft portion 65. When the fitting and gasket 55 are thus applied, the spring 53 will be placed in compression between the bottom of the cup-shaped member 43 and the sealing gasket 55 on the fitting 61. Preferably a washer 69 is applied in position between the gasket 55 and the spring 53 to protect the gasket against damage through direct engagement with the spring and to equalize spring pressure on the gasket substan tially throughout the radial extent of the gasket. The spring functions to thrust the cup-shaped member into engagement with the seat element 25 and to press the seat element upon the end of the bushing i1, thereby compressing the gasket 25 between the bushing and the disk forming the seat element 25 to thereby seal against fluid leakage between the bushing and the seat-forming disk 25. The spring operates also to compress the, sealing gasket 55 between the seat 59, the annular walls 45 of the cup-shaped member and the Washer 65, thereby sealing against fluid leakage between the fitting 6| and the walls of the cup-shaped member. The rubber-like gasket 55, when compressed, will grip th surfaces of the walls 45 and the surfaces forming the seat 59 to form a driving connection between the shaft and the cup-shaped member, whereby the latter is caused to rotate with the shaft and thus constitute a running seal between the seat element 25 and the seal element 45, the former being held against rotation with respect to the bushing ill by the latching stem 35, and the latter being driven by the shaft through the sealing gasket 55.

The fitting 6!, in addition to its gasket supporting function, may be threaded or otherwise formed, as at H, for connection with a coupling member is by means of which to drivingly connect the shaft with an vice, the coupling '73, in the illustrated embodiment, comprising a plate formed with a threaded opening for receiving the threaded portion of the fitting 6! and an annular spacing portion forming an annular scat l"? for rmeiving a shoulder 19 formed in the fitting til inwardly of the threaded portion H, so that the coupling may be associated operable desecured on the fitting and hence on the shaft 3| by screwing the coupling upon the fitting until the seat Tl wedging y rips the shoulder 19. To facilitate the application of the fitting El threadingly upon the shaft l3, it may be formed with peripherally opening sockets 8| for the reception of a turning tool which may be used to tighten the fitting firmly on the projecting end of the shaft.

It will be seen from the foregoing that I have provided an extremely simple seal assembly adapted for application on the projecting end of a shaft without reforming the shaft or the end of the bushing through which it extends, the assembly including a seat-forming element which may be applied in order to form a perfect running seal at the end of the bushing. The assembly also utilizes a part for the purpose of supporting a coupling member on the shaft outwardly of the seal, and since application of the seal to the shaft requires no reformation of the shaft, the seal assembly is particularly well suited for use asa replacement unit.

It is thought that the invention and its numerous attendant advantages will be fully understood from the foregoing description, and it is obvious that numerous changes may be made in the form, construction and arrangement of the several parts without departing from the spirit or scope of the invention, or sacrificing any of its attendant advantages, the form herein disclosed being a preferred embodiment for the purpose of illustrating the invention.

The invention is hereby claimed as follows:

1. A replacement seal for a rotating arbor having an end extending through and outwardly of a wall opening in a casing to be sealed, comprising a washer having a finished annular surface forming a seal seat on one face and an annular flange projecting from the opposite face thereof, a ring of elastic material seated on said opposite face within, and held in place by, said flange, said washer and ring forming a seal seat unit adapted for assembly on the projecting end of F the arbor in position with the ring engaging upon the casing wall around the opening through which said arbor extends, and a radial projecting finger on said washer and formed at its extremity for engagement with the wall at a point spaced from said opening to secure the washer against angular movement with respect to the wall.

2. A replacement seal for a rotating arbor having an end extending through and outwardly of a Wall opening in a casing to be sealed, comprising a Washer having a finished annular surface forming a seal seat on one face and an annular flange projecting from the opposite face thereof, a ring of elastic material seated on said opposite face within, and held in place by, said flange, said washer and ring forming a seal seat unit adapted for assembly on the projecting end of the arbor in position with the ring engaging upon the casing wall around the opening through which said arbor extends, a radial projecting finger on said washer and formed at its extremity for engagement with the wall at a point spaced from said opening to secure the washer against angular movement with respect to the wall, and cooperating seal means on said arbor including a member having" an annular seal face and means holding the member with its face in position engaging and forming a running seal with said seal seat.

WALTER W. 

